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Fencer Intel
medium 4.0

CVE-2026-40669 json

An off-by-one error in AMD Secure Encrypted Virtualization (SEV) firmware could allow an attacker with hypervisor access to corrupt the Rev…

published yesterday modified yesterday also EUVD-2026-123041

cvss
4.0
version 4.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.1%
EPSS 0.1% chance of exploitation in 30 days, percentile 4%
public exploits
0
none known

Summary

An off-by-one error in AMD Secure Encrypted Virtualization (SEV) firmware could allow an attacker with hypervisor access to corrupt the Reverse Map Table (RMP) table, potentially resulting in loss of guest memory integrity.

Patch / fix

  • AMD AMD EPYC™ 9004 Series Processors GenoaPI_1.0.0.J
  • AMD AMD EPYC™ 7003 Series Processors MilanPI-SP3_1.0.0.K
  • AMD AMD EPYC™ 8004 Series Processors GenoaPI_1.0.0.J
  • AMD AMD EPYC™ Embedded 7003 Series Processors EmbMilanPI-SP3 1.0.0.E
  • AMD AMD EPYC™ Embedded 9004 Series Processors (formerly codenamed "Genoa") EmbeddedGenoaPI_1.0.0.E
  • AMD AMD EPYC™ Embedded 9004 Series Processors (formerly codenamed "Bergamo") EmbeddedGenoaPI_1.0.0.E
  • AMD AMD EPYC™ Embedded 8004 Series Processors EmbeddedGenoaPI_1.0.0.E

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Exploit prediction

0.15% chance of exploitation in the next 30 days, higher than 4% of all scored CVEs (FIRST EPSS, 2026-11-11).

CVSS scores

assigned by version score vector
CNA 4.0 4.0 CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:N/VI:N/VA:N/SC:N/SI:H/SA:N
CNA 4.0 4.0 CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:N/VI:N/VA:N/SC:N/SI:H/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Affected products

  • AMD AMD EPYC™ 9004 Series Processors
  • AMD AMD EPYC™ 7003 Series Processors
  • AMD AMD EPYC™ 8004 Series Processors
  • AMD AMD EPYC™ Embedded 7003 Series Processors
  • AMD AMD EPYC™ Embedded 9004 Series Processors (formerly codenamed "Genoa")
  • AMD AMD EPYC™ Embedded 9004 Series Processors (formerly codenamed "Bergamo")
  • AMD AMD EPYC™ Embedded 8004 Series Processors

Classification

Weakness

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.